Full list of all 101 Left 4 Dead 2 achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 52 achievements, and there are 7 DLC packs containing 49 achievements.
Survive all campaigns on Expert.
In a Versus round, leave the saferoom to defibrillate a dead teammate.
Plays games with free weekend players and helps them survive a campaign.
Spread cheer by helping a free holiday player survive a campaign.
As the Jockey, ride a Survivor and steer them into a Spitter's acid patch.
Revive 10 dead Survivors with the defibrillator.
Collect 100 gas cans in Scavenge.
Cause 25 gas can drops as a Special Infected.
Collect 15 gas cans in a single Scavenge round.
Survive a campaign on Expert skill with Realism mode enabled.
Form a team and beat an enemy team in 4v4 Versus or Scavenge.
Win a game of Scavenge.
Stop the enemy team from collecting any gas cans during a Scavenge round.
As the Charger, grab a Survivor and carry them over 80 feet.
Navigate the impound lot and reach the cemetery safe room without tripping any alarms.
Cross the bridge finale in less than three minutes.
Defend yourself at the crashed airliner without taking damage.
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds.
As the Spitter, spit on a Survivor being choked by a Smoker.
As the Charger, bowl through the entire enemy team in a single charge.
Using a Molotov, burn a Clown leading at least 10 Common Infected.
Prove you are stronger than Moustachio.
Prove you are faster than Moustachio.
Kill 15 Infected with a single grenade launcher blast.
Revive 10 incapacitated Survivors while under the speed-boosting effects of adrenaline.
Kill a Jockey within 2 seconds of it jumping on a Survivor.
Rescue Gnome Chompski from the Carnival.
Honk the noses of 10 Clowns.
Collect 10 vials of Boomer vomit from infected CEDA agents you have killed.
As the Spitter, hit every Survivor with a single acid patch.
Kill 10 swampy Mudmen while they are in the water.
In a Survival round, get a medal only using melee weapons.
Kill a Tank with melee weapons.
Finish a campaign using only melee weapons.
Make a Survivor drop a gas can during overtime.
Ignite 50 Common Infected with incendiary ammo.
Survive the Parish campaign.
Use every melee weapon to kill Common Infected.
Survive the Hard Rain campaign.
Navigate the sugar mill and reach the safe room without killing any Witches.
Survive the Swamp Fever campaign.
Kill 100 Common Infected with the chainsaw.
Kill one of each Uncommon Infected.
Survive the Dark Carnival campaign.
Decapitate 200 Infected with a melee weapon.
Kill a Charger with a melee weapon while they are charging.
Use a bile bomb on a Tank.
As the Jockey, ride the Survivors twice in a single life.
As the Jockey, ride a Survivor for more than 12 seconds.
Survive the Dead Center campaign.
Deploy an ammo upgrade and have your team use it.
Kill a Spitter before she is able to spit.
As the Charger, grab a Survivor and crash them through 8 chairs at the wedding.
Play 5 full games of Scavenge on The Port.
Play 6 Mutations.
Using the M60, kill 25 infected without letting go of the trigger.
Kill a Tank only with damage from the original Survivors.
Collect 10 items dropped by a Fallen Survivor.
Play the new Midnight Riders song on a jukebox.
Knock off the heads of 18 infected with the golf club.
Open 5 foot lockers.
Survive The Passing Campaign.
As a Special Infected, incap someone who is trying to sacrifice themselves.
Have all 3 generators running at once in "The Sacrifice" finale.
Kill a Special Infected with an exploding barrel.
Complete "The Sacrifice".
Have Bill sacrifice himself for the team.
Survive the Cold Stream campaign on any difficulty.
Play a Versus game on Dead Air from start to finish.
Collect three gifts dropped by Special Infected in Versus Mode.
Kill 53,599 infected. You made sure the dead won't rise anymore!
Earn a gold medal on every official survival map.
Earn a silver medal on every official survival map.
Earn a bronze medal on every official survival map
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
As the Spitter, spit on a Survivor who is pinned by a Hunter.
Destroy 20 gascans as the Spitter.
Survive The Last Stand campaign on Expert Realism.
Survive for 10 minutes on any official map in Versus Survival.
Survive for 30 minutes on any official survival map.
Earn a gold medal on any official survival map.
Earn a silver medal on any official survival map.
Earn a bronze medal on any official Survival map.
Kill a Witch using only a sharp melee weapon, without anyone getting incapacitated or killed.
Kill the Witch bride with a single shotgun blast on expert difficulty.
Rescue three Survivors from a single rescue closet.
As the Spitter, spit on a Survivor who is pinned by a Charger.
Instantly kill a Survivor as the Charger.
Escape Liberty Mall's Atrium before the first Tank appears
On the concert finale, survive until the helicopter arrives without leaving the stage
Kill 20 Jockeys with the shovel or pitchfork.
Complete The Last Stand campaign in 13 minutes or less, without any Survivors dying.
With a sharp melee weapon, cut a Smoker's tongue before he ensnares you.
Discover the hidden room in the Last Stand campaign
Destroy a Tank's rock in mid-air.
Revive an incapacitated teammate while a Tank is nearby.
Kill a pouncing Hunter with a shotgun.
As the Hunter, land a 25 damage pounce.
As the Boomer, vomit on a Survivor without having direct line of sight with them.
Survive The Last Stand campaign on any difficulty.
If you are reading this achievement, Gabe Newell has successfully launched Gnome Chompski into space.